Fort Worth daily gazette. (Fort Worth, Tex.) 1882-1891, 1887-12-18
POPULAR SCIENCE.
Notes Of Invention and Discovery frsrn ihs
World Over.

! Notes Of Invention and Discovery frern III
World Over.
Artificial punice stone is now pre-
pared by molding and baking mixture o
white sand, feldspar and fire clay. Tai.
product is said to have superseded tn
nstursl stone in Germany and Austria.
A new screW-dTiVer acts upon the SANE
principle as SIT M winding watch.
stop pin and paWl limit the movement @
the shank ia one direction, while tht
handle will move backward without NOV
ing the shank.
The Lancet doubts that persons whC
perish in burning buildings suffer so muct
as has been popuIsrY supposed. Tie,
victim is generally made faint and pulse
| less by tide carbOnic acid or Cerbonic aciC
gas, and becomes insensible before the
fire reaches him.
Fragments Of food still recognizable il
the tartar of the teeth of our prehistoric
ancestors include por ions of corn husks
! spiral vessels ftOm vegetables, husks Of
starch, the point of e his tooth, sup
oosed oval cells Of fruits, barblets OF
feathers, portions of wool and bits OF
cartilage.
George Stephenson's perpetual mo-
| ton" machine consisted Of G. wooden
wheel, the periphery Of which was fur
ni-hed with glass tubes filed With quick
silver, and as the wheel rOtsted the quick
silver poured itself down into the lower
tubs 8, and thus sort of self-acting mo-
tion was kept up in the apparatus.
Silver may be dissolved in nitric acid,
and again reduced to metallic state by
adding copper, after removing excess Of
moisture by evaporation. Gold can be
dissolved in warm nitro muriatic acid,
and it may be recovered or reduced to 8
meta C tat. by precipitating win cop
peras and then melting the precipitate In
q crucible.
Mr.. G. r Monroe presented, in the
American Association, the results Of
some experiments in which blocks of gun
cotton, after having been stamped with
certain letters, were exploded, letter side
down, on fat pieces OF wrought iron
When the letters on the blCcEs were
stamped in relief they appeared in relief
on the iron after the explosion; but when
they were sunken ia the blocks they also
appeared sunken in the iron.
new invention for the propelling of
street cars 10 in the application Of he gas
engine to a moving train car. A such
attempts have failed heretofore for thu
reason that the gssengine starts and stops
too slowly. In this case the en-
CINE will be in motion continuously, and
the power will be thrown OF and on, rs
The occasion may require, by the use OF
movable friction wheels gesred on an end
less link belt This belt is to be attached
the engine. Ordinary Illuminating gas
Will be used.
A manufacturer of soldering coppers,
or "soldering- irons" as technically
known, has found that cast coppers are
much more apt TO be attacked by the
acids used in soldering than are coppers
which are forged up from bar instead
Of being cast. 1t il not stated why this
Is the case, but the manufacturer
in question has an idea that
small portion of oxide contained
in the cast metal ia partly, if not wholly
the cause Of this occurrence. He a!sU
st.'es that drop forgi 6 does not give tue
good results in manufacture of this tool
that hand-forglng presents. Ode OF his
arguments in regard to the mechanical
part Of the operation is that by hsnd-
forging he gets rid of the In left by the
press dies h:n ufacturers' Gazette.
Malaria 10 bling successfully treated in
the medical stations Of the Pupjaub with
picrate of ammonia. The usual dose ia
one-eighth of grain to one and half
grains, four or I've times Cay in pill
Halt grain is a fair average dose. Thus
given the result is soon visible. In the
CREST majority of the cases treated one
half grain doses In the interval prevented
the recurrence OF the next attack OF the
fever, while in about 20 per cent. Of the
patients two or three attacks folio we'd be-
fore the fever ceased. In only one case
of quartsn sgue, despite large doses of
The salt, the fever REQUIRED for six
periods, gradually diminishing in inten-
sity, and then yielding to 1t. tits equally
successful In all the forms of ague, but it
is curious fact that the cases in which
it failed to cure were all OF the tertian
variety.
The curious fsct that the usual heat
produced By friction is absent when the
articles are magnetized is just now being
discussed by scientists who are seeking
an X 1lanation. Very striking examples
are described in late number of scien-
tiflc periodical. workman fastened s
couple OF powerful magnets TO his lathe to
mold more securely piece OF metal
which ne wished to drill and turn. The
presence of the magnets kept the metal
SO cold that no waller was needed to keep
the drill moist and cool. This unusual
circumstance may lead TO important me-
chanical advantages. It is such circum-